Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The rich resources of the country in horses, oxen, sheep, and goats, in which Libya by reason of its Nomad economy perhaps excelled at that time, as Polybius testifies, all other lands of the earth, were of great advantage to the Carthaginians.
As these were the instructors of the Romans in the art of profitably working the soil, they were so likewise in the art of turning to good account their subjects; by virtue of which Carthage reaped indirectly the rents of the "best part of Europe," and of the rich--and in some portions, such as in Byzacitis and on the lesser Syrtis, surpassingly productive--region of northern Africa.
Commerce, which was always regarded in Carthage as an honourable pursuit, and the shipping and manufactures which commerce rendered flourishing, brought even in the natural course of things golden harvests annually to the settlers there; and we have already indicated how skilfully, by an extensive and evergrowing system of monopoly, not only all the foreign but also all the inland commerce of the western Mediterranean, and the whole carrying trade between the west and east, were more and more concentrated in that single harbour.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=34